Knee Effusion

The knee is a hinge joint, one of the most frequently injured joints in the body. This joint contains multiple bursae or saclike structures containing synovial fluid. The bursae are located between the skin and bony prominences. Some of these bursae communicate with the knee joint. Fluid accumulation in a joint's intraarticular space and bursae is called an "effusion."

Knee effusions can occur at any age. The condition often presents with knee swelling, pain, stiffness, and limited range of motion. Knee effusions arise from various causes. Proper diagnosis and management typically involve identifying the effusion's underlying cause through clinical evaluation, imaging studies, and possibly joint fluid analysis. Treatment may include rest, ice, elevation, anti-inflammatory medications, physical therapy, and, in some cases, knee fluid drainage.